Devil May Cry 5 walkthrough/SM02

Location
This Secret Mission is located at Mission 03: Flying Hunter, after opening the path to a fire exit by destroying two Blood Clots, instead of going up the stairs, go all the way down and enter the small tunnel, then point the camera to the pattern.

Walkthrough
The goal of this Secret Mission is to kill all Empusas before they are able to escape, as such, using the Ragtime of Devil Breakers is a good idea as it will slow down the Empusas and allow you to deal more damage to them.